getMany method
Bulk fetch — returns the values for every key in keys that
is currently present. Keys that are absent are NOT included
in the returned map.
Implementation
@override
Future<Map<String, AtNotification>> getMany(List<String> keys) async {
final result = <String, AtNotification>{};
for (final k in keys) {
final n = await get(k);
if (n != null) result[k] = n;
}
return result;
}